[Google Maps API v2] Update marker from json file

Fri, 16 Mar 2012 13:46:00 -0700 

Im trying to update the marker from a json format but it is not
working.
Can you please help me, here is the code below.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
<html xmlns="http://www.w3.org/1999/xhtml";>
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/
>
    <title>Map test</title>
    <h2>Google Map</h2>
    <script src="http://maps.google.com/maps?
file=api&v=2&key=ABQIAAAAR0TWf73rulOP_SnETQPFKxRj5djmSsmVAgDaRb1psFcJlThRhxSjxifqM96NjrBsBn2XrZWSE-
QQqQ"
       type="text/javascript"></script>
    <script type="text/javascript">
    //<![CDATA[
jsonData =
     {"markers": [
     {"lat":"-29.86868", "lng":"30.981588"},
     {"lat":"-29.85368", "lng":"30.980927"},
     {"lat":"-29.86100", "lng":"30.980755"}
   ],}

 var map = null;
var route = null;
var Marker = null;
var point = null;
var count = 0;
var delay = 5000;
var loops = 5;

function load() {
  if (GBrowserIsCompatible()) {
    map = new GMap2(document.getElementById("map"));
    map.addControl(new GSmallMapControl());
    map.addControl(new GMapTypeControl());
    map.setCenter(new GLatLng(-29.870879, 30.977258), 10);

  var jsonData = eval('(' + doc + ')');
  var point = new GLatLng(jsonData.markers[count].lat,
jsonData.markers[count].lng);
  Marker = new GMarker(point);
  map.addOverlay(Marker);


  route = setTimeout("moveIT()", 4000);
 }
     }


function moveIT() {
  count++;
  if(count > jsonData.makers.length - 1) {
        count = 0;
        loops--;
  }


  point = new GLatLng(jsonData.markers[count].lat,
jsonData.markers[count].lng);
  Marker.setLatLng(point);

  if (loops > 0)
  {
        route = setTimeout("moveIT()", delay);
  }
}

    </script>
  </head>
  <body onload="load()" onunload="GUnload()">
    <div id="map" style="width: 800px; height: 600px"></div>
  </body>
</html>

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